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[2005-12-12 14:51 UTC] vovik at getart dot ru
Description:
------------
I using 'LogFormat "%h %l %u %t \"%r\" %>s %b php(%{mod_php_memory_usage}n)" common' in httpd.conf for logging php memory usage.
If php script exited on fatal error due to memory limitation, %{mod_php_memory_usage}n keeps high value for all following requests to this apache child.
Reproduce code:
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if (@$_GET["test"] == 1) {
print "Allocated: ".memory_get_usage();
} else {
ini_set("memory_limit", 1048576 * 100); // 100K
// PHP exited in file_get_contents with message:
// PHP Fatal error: Allowed memory size of 104857600 bytes exhausted
$bigfile = file_get_contents("/etc/termcap"); // this file is about 800K on my host
}
First, run this script without parameter, next with ?test=1. Check apache log then.
Expected result:
----------------
[12/Dec/2005:13:28:47 +0000] "GET /test.php HTTP/1.1" 200 - php(806944)
[12/Dec/2005:13:28:57 +0000] "GET /test.php?test=1 HTTP/1.1" 200 16 php(*****) // not the same as previous, should be much lower
Actual result:
--------------
[12/Dec/2005:13:28:47 +0000] "GET /test.php HTTP/1.1" 200 - php(806944)
[12/Dec/2005:13:28:57 +0000] "GET /test.php?test=1 HTTP/1.1" 200 16 php(806944)
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Last updated: Thu Oct 30 22:00:01 2025 UTC |
I'll try to explain the issue more clear. If one php script (heavy.php) tried to allocate memory more than memory_limit php.ini setting it will exited with fatal error ("Allowed memory size exhausted"). In apache access_log it reports highest memory value used (close to php memory_limit). Another script (light.php), which allocate small amount of memory, executed after. And it will report in access_log the same high value as heavy.php. Obviously, it happens only if light.php executed on the same apache child. If i try to call memory_get_usage() in light.php - it reports normal low value. But in access_log it still the same as heavy.php. All following requests to this apache child reports one value for memory peak in access_log. As result, access_log looks like this: "GET /heavy.php HTTP/1.1" 200 - php(806944) "GET /light.php HTTP/1.1" 200 16 php(806944) "GET /something.php HTTP/1.1" 200 160 php(806944) ... and so on ... It looks like php keeps allocated memory peak and not drops it after fatal error due to memory limitation.I've tried latest php4 snapshot (php4-STABLE-200512131136) and got the same result. But in php5 this issue is solved. I've compared sources of php4 and php5. Solution looks very simple. *** php4-STABLE-200512131136/Zend/zend_alloc.c.orig 2005-12-13 12:56:25.375626097 +0000 --- php4-STABLE-200512131136/Zend/zend_alloc.c 2005-12-13 12:57:23.877054536 +0000 *************** *** 538,543 **** --- 538,544 ---- #if MEMORY_LIMIT AG(memory_exhausted)=0; + AG(allocated_memory_peak)=0; #endif